Ludwig. The Old Chisholm Trail. Texas A&M University Press.
芝加哥风格引文Ludwig. The Old Chisholm Trail. Texas A&M University Press.
MLA引文Ludwig. The Old Chisholm Trail. Texas A&M University Press.
警告：这些引文格式不一定是100％准确.
APA引文
Ludwig. The Old Chisholm Trail. Texas A&M University Press.
芝加哥风格引文Ludwig. The Old Chisholm Trail. Texas A&M University Press.
MLA引文Ludwig. The Old Chisholm Trail. Texas A&M University Press.